RSP: 002b:00007ffcd64c5aa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fe35360e0ec RCX: 00007fe35358d169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000009 R08: 00007ffcd64c3847 R09: 00007ffcd64c6d60
R10: 0000000000000009 R11: 0000000000000246 R12: 00007ffcd64c6d60
R13: 00007fe35360e08c R14: 000055556079e4a8 R15: 00007ffcd64c7e30
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
BUG: KASAN: null-ptr-deref in atomic_inc_return include/linux/atomic/atomic-instrumented.h:198 [inline]
BUG: KASAN: null-ptr-deref in ihold+0x20/0x60 fs/inode.c:452
Write of size 4 at addr 0000000000000170 by task syz-executor/11289
CPU: 1 PID: 11289 Comm: syz-executor Tainted: G W 6.1.129-syzkaller-00049-g1c9aeb1ce34b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
print_report+0xe1/0x4e0 mm/kasan/report.c:430
kasan_report+0x13c/0x170 mm/kasan/report.c:531
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x294/0x2a0 mm/kasan/generic.c:189
__kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
atomic_inc_return include/linux/atomic/atomic-instrumented.h:198 [inline]
ihold+0x20/0x60 fs/inode.c:452
d_delete_notify include/linux/fsnotify.h:289 [inline]
vfs_rmdir+0x268/0x500 fs/namei.c:4203
incfs_kill_sb+0x113/0x230 fs/incfs/vfs.c:1995
deactivate_locked_super+0xad/0x110 fs/super.c:334
deactivate_super+0xbe/0xf0 fs/super.c:365
cleanup_mnt+0x485/0x510 fs/namespace.c:1186
__cleanup_mnt+0x19/0x20 fs/namespace.c:1193
task_work_run+0x24d/0x2e0 kernel/task_work.c:203
exit_task_work include/linux/task_work.h:39 [inline]
do_exit+0xbd0/0x2b80 kernel/exit.c:877
do_group_exit+0x21a/0x2d0 kernel/exit.c:1027
__do_sys_exit_group kernel/exit.c:1038 [inline]
__se_sys_exit_group kernel/exit.c:1036 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036
x64_sys_call+0x610/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe35358d169
Code: Unable to access opcode bytes at 0x7fe35358d13f.
RSP: 002b:00007ffcd64c5aa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fe35360e0ec RCX: 00007fe35358d169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000009 R08: 00007ffcd64c3847 R09: 00007ffcd64c6d60
R10: 0000000000000009 R11: 0000000000000246 R12: 00007ffcd64c6d60
R13: 00007fe35360e08c R14: 000055556079e4a8 R15: 00007ffcd64c7e30
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000170
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 1250a2067 P4D 1250a2067 PUD 0
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 11289 Comm: syz-executor Tainted: G B W 6.1.129-syzkaller-00049-g1c9aeb1ce34b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:arch_atomic_add_return include/linux/instrumented.h:-1 [inline]
RIP: 0010:arch_atomic_inc_return include/linux/atomic/atomic-arch-fallback.h:440 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:199 [inline]
RIP: 0010:ihold+0x25/0x60 fs/inode.c:452
Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 c1 1a a8 ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 00 c8 ef ff bb 01 00 00 00 41 0f c1 9e 70 01 00 00 ff c3 bf 02 00 00 00 89 de e8 44 1e a8
RSP: 0018:ffffc900012c7a90 EFLAGS: 00010246
RAX: ffff88811c4fe500 RBX: 0000000000000001 RCX: ffff88811c4fe540
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900012c7aa0 R08: ffffffff8144b443 R09: fffffbfff0f6e8fd
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff11022cf997f
R13: ffff8881172f3110 R14: 0000000000000000 R15: 1ffff11022e5e628
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 0000000121f79000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
d_delete_notify include/linux/fsnotify.h:289 [inline]
vfs_rmdir+0x268/0x500 fs/namei.c:4203
incfs_kill_sb+0x113/0x230 fs/incfs/vfs.c:1995
deactivate_locked_super+0xad/0x110 fs/super.c:334
deactivate_super+0xbe/0xf0 fs/super.c:365
cleanup_mnt+0x485/0x510 fs/namespace.c:1186
__cleanup_mnt+0x19/0x20 fs/namespace.c:1193
task_work_run+0x24d/0x2e0 kernel/task_work.c:203
exit_task_work include/linux/task_work.h:39 [inline]
do_exit+0xbd0/0x2b80 kernel/exit.c:877
do_group_exit+0x21a/0x2d0 kernel/exit.c:1027
__do_sys_exit_group kernel/exit.c:1038 [inline]
__se_sys_exit_group kernel/exit.c:1036 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036
x64_sys_call+0x610/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe35358d169
Code: Unable to access opcode bytes at 0x7fe35358d13f.
RSP: 002b:00007ffcd64c5aa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fe35360e0ec RCX: 00007fe35358d169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000009 R08: 00007ffcd64c3847 R09: 00007ffcd64c6d60
R10: 0000000000000009 R11: 0000000000000246 R12: 00007ffcd64c6d60
R13: 00007fe35360e08c R14: 000055556079e4a8 R15: 00007ffcd64c7e30
Modules linked in:
CR2: 0000000000000170
---[ end trace 0000000000000000 ]---
RIP: 0010:arch_atomic_add_return include/linux/instrumented.h:-1 [inline]
RIP: 0010:arch_atomic_inc_return include/linux/atomic/atomic-arch-fallback.h:440 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:199 [inline]
RIP: 0010:ihold+0x25/0x60 fs/inode.c:452
Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 c1 1a a8 ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 00 c8 ef ff bb 01 00 00 00 41 0f c1 9e 70 01 00 00 ff c3 bf 02 00 00 00 89 de e8 44 1e a8
RSP: 0018:ffffc900012c7a90 EFLAGS: 00010246
RAX: ffff88811c4fe500 RBX: 0000000000000001 RCX: ffff88811c4fe540
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900012c7aa0 R08: ffffffff8144b443 R09: fffffbfff0f6e8fd
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff11022cf997f
R13: ffff8881172f3110 R14: 0000000000000000 R15: 1ffff11022e5e628
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 0000000121f79000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 00 00 add %al,(%rax)
4: 00 55 48 add %dl,0x48(%rbp)
7: 89 e5 mov %esp,%ebp
9: 41 56 push %r14
b: 53 push %rbx
c: 49 89 fe mov %rdi,%r14
f: e8 c1 1a a8 ff call 0xffa81ad5
14: 49 8d be 70 01 00 00 lea 0x170(%r14),%rdi
1b: be 04 00 00 00 mov $0x4,%esi
20: e8 00 c8 ef ff call 0xffefc825
25: bb 01 00 00 00 mov $0x1,%ebx
* 2a: f0 41 0f c1 9e 70 01 lock xadd %ebx,0x170(%r14) <-- trapping instruction
31: 00 00
33: ff c3 inc %ebx
35: bf 02 00 00 00 mov $0x2,%edi
3a: 89 de mov %ebx,%esi
3c: e8 .byte 0xe8
3d: 44 1e rex.R (bad)
3f: a8 .byte 0xa8